Reiko Nishibori, the daughter of copycat criminal Mitsuya Nishibori and former host of the Seeker Roidmude, is to be released from prison. Gou Shijima, who identified with Reiko due to their similar backgrounds, took the stand during the trial and testified in her favor, also deciding to support her after her release. He was eagerly waiting for this day to come. Gou’s older sister Kiriko, now a wife and a mother, wishes for his happiness from the bottom of her heart.

However, on the night of Reiko’s release, a series of murders took place. The murder weapon seems to be woman’s hair. Reiko is shown on the camera feed taken from the murder scene. Shinnosuke Tomari, an officer of the Special Circumstances Team of the 1st Division of Investigations, marks Reiko as a suspect. Gou, believing in Reiko’s innocence, aids her escape. Reiko, however, believes that “The child of a monster cannot escape the curse laid upon them” and leaves Gou’s side. Gou, at loss of any motivation, is met by an unlikely individual.

Is Reiko the culprit? Gou, with his feelings for Reiko and the strength of an irreplaceable friendship, goes after the truth!

Heart’s story:

It has been a few years since Chase disappeared and people slowly forgot about the Roidmude threat. However, Heart has been revived! And within him, the cores of Brain and Medic! At the same time, hostile creatures very similar to the Roidmudes are attacking people. Heart thinks, “I don’t want to witness Roidmudes clinging to a lost past and attacking people”. Out of this desire, Heart volunteers to assist Inspector Otta in the investigations.

It is discovered that the people targeted were copy models of previous Roidmudes and Misuzu Hatori, Medic’s copy model, is attacked by a mysterious monster. It has the appearance of all the Roidmudes combined and the number on its chest is 5886. Heart deduces the identity and terrifying objective of this monster. However, since he is unable to regain his power as a Roidmude, he is at a big disadvantage. However, Shinnosuke Tomari appears before him…